JP4965093B2 - Converter slag outflow quantification method, converter operation method and apparatus thereof - Google Patents

Description

  The present invention captures the state of steel output from the converter with a visible camera and an infrared camera and processes the image, thereby quantitatively calculating the amount of slag that has flowed out of the converter furnace into the steel pan and calculating slag outflow TECHNICAL FIELD The present invention relates to a converter slag outflow amount quantification method, a converter operation method, and an apparatus for determining and controlling the input amount of a slag modifier based on the amount.

  The hot metal from the blast furnace is charged into the converter and decarburized and blown into molten steel for component adjustment. This molten steel is transferred from the inside of the converter furnace to the pan called the steel receiving pan through the outlet port by tilting the converter main body at the time of steel output. However, there is a possibility that slag generated during decarburization blowing will also flow into the steel flow at this time and flow into the steel pan simultaneously with the molten steel. For this reason, by using the slag detection device, the timing at which the slag begins to flow out is detected, the timing is notified to the operator, and the slag to the steel pan is returned to the upright state. I try to prevent spillage.

As a conventional technique related to slag detection, for example, there is a detection technique called a slag detection method disclosed in Japanese Patent Laid-Open No. 9-182953 (Patent Document 1). Here, a technique for discriminating between slag and molten steel from the difference in emissivity between slag and molten steel with an infrared camera and determining that slag is flowing out when the ratio of slag to molten steel exceeds a certain threshold is disclosed. ing.
Japanese Patent Laid-Open No. 9-182953

  However, the technique disclosed in Patent Document 1 is used for minimizing the amount of slag that flows out at the end of steelmaking, called slag. In actual operation, there is a slag called the outpost, which flows out at the moment when the steel starts from the converter, so even if the technique disclosed in Patent Document 1 is used, the slag outflow into the steel receiving pan is completely eliminated. The current situation is unavoidable.

  Because of this slag outflow, aluminum is introduced into the slag that has flowed into the steel pan, and the slag is reformed. It is only necessary to be able to administer the amount of reforming aluminum (determined from the steel type and slag amount) commensurate with the amount of slag that has flowed out. Overdose. The current situation depends on the operator's visual judgment (such as estimating the slag thickness in the steel pan) to specify the amount of slag.

  The present invention has been made in view of the above problems, and quantifies the amount of slag in the steel pan and quantifies the amount of converter slag effluent that minimizes the amount of reformed aluminum that has been excessively administered. It is to provide a method, a method of operating a converter and an apparatus thereof.

The above problem can be solved by the following means.
[1] A converter slag outflow amount quantification method for quantifying the amount of slag flowing out from a converter into a steel pan,
Triggered by the reception of the steel start signal,
The steel flow flowing out from the steel outlet of the converter is imaged with a visible camera and infrared camera,
The flow rate of the steel exit flow is obtained by image processing of an image captured by a visible camera, the width of the steel exit flow is obtained by image processing of an image captured by an infrared camera, and the area ratio occupied by the slag and molten steel is determined. Calculate the slag width based on the area ratio and the width of the steel flow,
A converter slag outflow amount quantification method, wherein a process of calculating a slag outflow amount based on the calculated flow rate and slag width of a steel output flow is performed until reception of a steel output end signal .

[2] In the converter slag outflow quantification method according to [1] ,
The converter slag outflow amount quantification method characterized in that the area ratio is calculated by ternizing an image captured by an infrared camera with luminance.

[3] In the method for quantifying the amount of outflow of converter slag according to any one of [1] or [2] ,
Estimating the flow rate and slag width of the steel flow immediately after the steel outlet from the flow rate and slag width of the calculated steel flow, and calculating the slag flow rate based on them, Method.

[4] In the converter slag outflow quantification method according to any one of [1] to [3] ,
A converter slag outflow amount quantification method characterized in that, when a slag cut ball is used at the end of the steel output, the flow is calculated as a hollow cylindrical steel output from the timing of the start of use of the slag cut ball.

[5] A converter slag outflow quantification device for quantifying the amount of slag flowing out from a converter into a steel pan,
A converter control device for issuing a steel output start signal and a steel output end signal;
A visible camera and an infrared camera for imaging the steel exit flow flowing out from the steel exit of the converter;
Image processing means for performing image processing of the captured image, slag flow velocity calculating means and slag width calculating means for calculating the flow speed and slag width of the outgoing steel flow based on the data of the image processing means, and starting from the start of steel output based on them A slag outflow amount calculating device for calculating the slag outflow amount until the end of steel ,
The slag width calculating means obtains the width of the outgoing steel flow and the area ratio occupied by the slag and molten steel by image processing of an image captured by an infrared camera, and calculates based on the area ratio and the width of the outgoing steel flow A converter slag outflow amount quantification device characterized in that:

[6] In the converter slag outflow quantification device according to [5] ,
The converter slag outflow amount quantification apparatus, wherein the slag width calculation means calculates the area ratio by ternizing an image captured by an infrared camera with luminance.

[7] In the converter slag outflow quantification device according to any of [5] or [6] ,
The slag outflow rate calculating device estimates the flow rate and slag width of the outgoing steel flow immediately after the outgoing steel outlet from the calculated flow rate and slag width of the outgoing steel flow, and calculates the slag outflow amount based on them. A converter slag outflow quantification device characterized in that.

[8] In the converter slag outflow quantification device according to any one of [5] to [7] ,
When the slag outflow amount calculating device uses a slag cut ball at the end of steel output, the slag outflow amount is calculated as a hollow cylindrical steel output from the timing of starting the use of the slag cut ball. Runoff quantification device.

[9] The slag thickness in the receiving steel pan is calculated in real time from the slag outflow amount obtained by the converter slag outflow amount quantification method according to any one of [1] to [4]. A method for calculating the slag thickness in the steel pan.

[10] Based on the slag thickness calculated by the slag thickness calculation method in the steel receiving pan described in [9] above, the T.V. T. in a converter slag characterized by estimating Fe. Fe estimation method

[11] Based on the slag thickness calculated by the slag thickness calculation method in the steel receiving pan described in [9] , the input amount of the slag modifier is determined, and the input amount of the slag modifier is controlled. A method of operating a converter characterized by that.

[12] A converter control device that generates a steel output start signal and a steel output end signal;
A visible camera and an infrared camera for imaging the steel exit flow flowing out from the steel exit of the converter;
Image processing means for performing image processing of the captured image, slag flow velocity calculating means and slag width calculating means for calculating the flow speed and slag width of the outgoing steel flow based on the data of the image processing means, and starting from the start of steel output based on them A slag outflow amount calculating device for calculating the slag outflow amount until the end of steel ,
A slag thickness calculation device for calculating the slag thickness in the receiving steel pan from the slag outflow amount calculated by the slag outflow amount calculation device;
A slag modifier calculation / control device that determines the input amount of the slag modifier based on the slag thickness calculated by the slag thickness calculator, and controls the input amount of the slag modifier;
The slag width calculating means obtains the width of the outgoing steel flow and the area ratio occupied by the slag and molten steel by image processing of an image captured by an infrared camera, and calculates based on the area ratio and the width of the outgoing steel flow A converter operating device characterized by that.

  The present invention quantifies the amount of slag flowing into the pan when receiving steel from the converter, and calculates the T.I. While estimating Fe and determining and controlling the amount of modifier to be introduced based on the slag thickness, it became possible to optimize the modifier.

  FIG. 1 is a diagram showing a slag outflow measuring device according to the present invention. In the figure, 1 is a converter, 2 is a steel outlet, 3 is a steel receiving pan, 4 is a molten steel cart, 5 is molten steel, 6 is slag, 7 is a visible camera, 8 is an infrared camera, and 9 is a converter control device. , And 10 respectively denote a slag outflow amount calculation device. After the blowing is completed in the converter 1, the furnace body is tilted and the molten steel 5 mixed with the slag 6 is poured from the steel outlet 2 into the steel receiving pan 3 on the molten steel carriage 4. ing. The state of steel output from the converter is imaged by two types of cameras, a visible camera 7 and an infrared camera 8, and the slag outflow amount calculation device 10 uses the captured images to calculate the amount of slag in the steel receiving pan 3. A quantification calculation is performed, and in some cases, the amount of reforming aluminum input is determined based on the calculation result. The converter control device 9 is a device for controlling a series of operations such as blowing and tapping steel in the converter 1, for example, signals such as tapping start / completion signal, use / non-use of slag cut balls, and the like. It is sent to the calculation device 10.

  The visible camera 7 is a camera for capturing an image for calculating the flow velocity of the steel flow, and there are various apparatus specifications and shooting conditions depending on the target. For example, the shutter speed is 1/10000 second per second. The number of frames is 100. The infrared camera 8 is a camera for capturing an image for calculating the ratio of slag to molten steel and molten steel and calculating the slag width. For example, the number of frames of the camera is 30 per second. .

  FIG. 2 is a diagram showing a flow of measurement processing of the present invention. First, in step 100, the process is started, and in step 101, reception of a steel output start signal is awaited. When the start of steel output is received from the converter control device 9, data acquisition from the infrared camera is started in step 102. Processing of image data from the infrared camera will be described later.

  In step 103, it is determined whether or not the number of pixels equal to or higher than the threshold value corresponding to the molten steel among the pixels in the imaging range of the infrared camera has exceeded a certain number (predetermined value). If this is satisfied, the slag outflow called the outpost is finished, and it is determined that full-scale molten steel has been started, and image capturing by the visible camera 7 is started (step 104). Measurement with a visible camera is performed at a preset interval and pitch. In the latter half of the steel output, the rear iron starts to mix, so it is better to measure at a short pitch. The reason why the images are taken many times during the steel output is that the flow rate of the steel output changes over time from the start of steel output to the end of steel output. The cause of the change over time is that the amount of molten steel present in the converter furnace decreases with the steel output, and the height of the molten metal surface from the brick in the furnace (the taphole) decreases. When calculating the slag outflow amount, the slag amount is proportional to the flow rate of the outgoing steel flow, so the flow rate of the outgoing steel flow is an important factor. Therefore, it is necessary to measure the flow velocity at as many points as possible within the steel output time. If more precise measurement is necessary, the measurement pitch should be shortened and the measurement with a visible camera should be performed.

  In step 105, the flow rate of slag shown below is calculated. For example, 100 images are shot each time with a visible camera at a certain time during steelmaking. Using two consecutive images taken, a reference analysis region is set in the first image. Then, the normalized correlation calculation of the analysis region is performed using the first and second images. The first and second images are correlated in luminance, and the portion with the largest correlation is considered to indicate the same region as the analysis region determined in the first image, so the second image from the position of the analysis region in the first image Calculate how many pixels have moved to the analysis area. The movement distance is calculated by multiplying the movement amount by the actual distance per pixel in the image. In the above example, since the shooting interval between images is 1/100 second, by multiplying the previous moving distance by 100, the flow rate (second speed) of the steel output flow can be calculated. This process is continuously performed up to 100 images, and the average value of these values is used as the flow velocity at that timing. At points other than the capture timing, a value obtained by linear interpolation using the flow velocity at the capture timing before and after that point is used as the flow velocity. In the present invention, the flow rate of the outgoing steel flow is treated as the same as the flow rate of the slag.

  In step 106, the ratio of slag to molten steel and the slag width in the outgoing steel flow by the infrared camera 8 are calculated. Details of the processing are shown in FIG. 3 as a processing flow. First, in step 200, image data is captured. Depending on the subject, for example, 30 frames are captured per second. Next, in step 201, each pixel of the image data is ternarized by luminance. That is, it is discriminated whether each pixel is occupied by others such as molten steel, slag and background based on the luminance level.

  In step 202, the number of ternarized pixels is counted. Further, in step 203, the area ratio a (0.0 to 1.0) of the slag and molten steel represented by the equation (1) is calculated.

a = Number of slag pixels / number of molten steel pixels (1)
Next, in step 204, the slag width is calculated. When the molten steel width obtained by the infrared camera is D and the slag width when the slag is evenly arranged in the length direction is d ₁ while maintaining the area ratio a of the slag and molten steel obtained above, the following equation (2) It is expressed as

d ₁ = D × a (2)
FIG. 4 is a diagram schematically showing the above calculation. This shows how the area ratio a of slag and molten steel and the slag width d ₁ are obtained from the image data at the left end. FIG. 5 is a diagram illustrating an AA cross section of the molten steel flow shown in the rightmost diagram of FIG. 4. The previously obtained slag width d ₁ merely represents the portion that is visible on the surface of the steel output flow, and in fact, it is considered that the slag is buried in the steel output flow. Therefore, the true slag diameter of the buried portion is d ₂ and is expressed as the following equation (3).

d ₂ = d ₁ × k ₁ (3)
Here, k ₁ is a parameter for converting from d ₁ to d ₂ . The above is the processing procedure for calculating the ratio of slag to molten steel and molten steel and the slag width using an infrared camera.

    Now, returning to the processing flow of FIG. In response to the slag flow velocity calculation in step 105 and the slag width calculation in step 106, the slag flow rate Q is finally calculated in step 107 based on the following equation (4).

_{Q = (d 2/2)} 2 × π × v × T × k 2 ········· (4)
Here, π is the circularity ratio, v is the flow rate of the outgoing steel flow, T is the sampling period of the infrared camera, and k ₂ (> 0.0) is corrected because the density of the molten steel may be small. It is a parameter to do.

Since the steel flow from the converter is always falling in the middle of falling into the steel pan, it is supposed that the camera is shooting the air in the air. Accordingly, the width of the molten steel is increased by the amount of air that is involved, and the density is smaller than it looks. Therefore, in order to prevent such an influence, the molten steel width in the vicinity of the steel outlet, which is considered to have little air entrainment, is calculated from the width of the steel outlet flow in the imaging region. The slag flow velocity calculation also represents the flow velocity in the imaging region, which is faster than the flow velocity near the steel exit, and is corrected for the flow velocity near the steel exit as shown below. As described above, the accuracy of the slag flow rate calculation is further improved by obtaining the width and flow velocity of the outgoing steel flow near the outgoing steel outlet.

In actual measurement, the steel outlet is not always photographed, but the middle part between the steel outlet and the steel pan is photographed. In this part, the bulk density of the molten steel is reduced due to the entrainment of air, and if the molten steel width and the flow velocity of this part are used, the amount of steel output and the amount of slag are largely calculated. Therefore, the molten steel width in the vicinity of the steel outlet is calculated from the molten steel width in the photographed image, and the amount of steel output and the amount of slag are calculated. Hereinafter, the procedure will be described with reference to FIG.

Based on the images taken by the infrared camera, different heights in the image (different positions in the vertical direction of the image) molten steel width reference points (predetermined preset positions, positions a and b in FIG. 6) are determined, and a And the molten steel width | variety of the part of b is calculated. Based on the amount of change in the width between a and b, this is extrapolated to calculate the width of the outgoing steel flow at the outgoing steel outlet c. In addition, as a result of this calculation, when the width of the outgoing steel flow at the outgoing steel outlet c becomes equal to or smaller than a predetermined value (for example, the diameter of the outgoing steel outlet), the value is reset to a predetermined value.
Next, as for the flow rate of the outgoing steel flow, the flow rate V _ab at a predetermined position between a and b is calculated using image data obtained by a visible camera. Then, the flow velocity V _c near the steel outlet is calculated by the following equation (5).

V _c = (V _ab ² −2gh) ^1/2 ... (5)
Here, g represents a gravitational acceleration, and h represents a height from a predetermined position where the flow velocity was previously obtained to a steel outlet.
Returning to FIG. 2 showing the processing flow, when a steel output end signal is received in step 108, the process goes to step 109 and the process is ended. Until then, the process returns to steps 105 and 106, and calculation of slag flow rate and the like is performed. Repeat in the cycle.

  In order to minimize the outflow of slag to the steel receiving pan at the end of steelmaking, a spherical object made of an intermediate specific gravity between slag and molten steel, sometimes called a slag cut ball, may be used. FIG. 7 shows the state of the steel output flow during normal steel output and when a slag cut ball is used. In the figure, 2 represents a steel outlet, 13 represents molten steel (including a state in which slag is mixed), 11 represents a furnace shell, and 12 represents a slag cut ball.

In the state (a) in which a normal slag cut ball is not used, the molten steel 13 inevitably flows out with the same width as the brick of the steel outlet 2, but when the slag cut ball is used (b), Although the steel port 2 is not completely covered by the slag cut ball 12, the molten steel does not come out from the entire steel outlet as in the normal state, and the molten steel flows out from the gap between the steel outlet and the slag cut ball. To come. On the measurement image, the width of the output steel flow does not change, but since it has a hollow cylindrical shape with no contents, using the same slag calculation model as the normal state results in a large amount of slag estimation. . Therefore, the parameter k ₂ described above is smaller than the parameter value that has been used since the start of steelmaking from the slag cut ball use timing (for example, receiving a slag cut ball use start signal from the converter control device 9). By changing to, the apparent density is reduced, and the state of the outgoing steel flow in which the molten steel shape is hollow is modeled.

The above-described tuning of the parameters k ₁ and k ₂ is performed by comparing the measured value of the slag thickness with the slag thickness calculated by this apparatus (the slag outflow amount is divided by the cross-sectional area of the steel pan and converted into the thickness). The method of measuring the actual value of the slag thickness is that when the steel receiving pan containing the molten steel produced from the converter arrives at the vacuum degassing facility, which is the next manufacturing process, The operator inserts a metal pipe, and the measured value of the width of the slag adhering to the inserted metal pipe is the measured value of the slag thickness.

  FIG. 8 is a diagram showing an example in which the calculation result based on the present invention is compared with the actual measurement value by the operator at the end of RH, regarding the thickness of the slag in the steel receiving pan. From the figure, it can be seen that a good correlation is obtained between the two. In this way, the slag thickness that could not be grasped as measured by the operator at the end of RH can be quantified in real time during operation.

Furthermore, the inventors investigated the relationship between the calculated slag thickness and the T.Fe (weight%) in the slag in detail using operation data of several hundred points. Here, T.Fe in slag is called TotalFe (total iron), and is the total iron content of all iron oxides (FeO, Fe ₂ O ₃ etc.) in slag, Measurements are made by component analysis after the end of RH. FIG. 9 is a diagram showing an example in which the relationship between the calculated slag thickness and T.Fe in the slag is examined. Although there is variation between the two, it can be confirmed that there is a correlation between the two, that is, T.Fe in the slag increases as the slag thickness increases.

In converter operation, it is desired to keep the T.Fe value in the slag low (for example, 7% or less) and keep it constant. The Al reforming reaction in the converter is shown in the following formula (6).
3FeO + 2Al → 3Fe + Al ₂ O ₃ (6)
When the amount of modified Al is large, the reaction proceeds and the amount of generated Fe increases. Conversely, when the amount of modified Al is small, the reaction does not proceed and the amount of generated Fe decreases.

  From this and the investigation result of the slag thickness calculation value and T.Fe in the slag, when the slag thickness is measured, it indicates that T.Fe is high. It is determined that the operation state is excessive, and the amount of Al modifier is reduced. Conversely, if the slag thickness is measured as thin, it indicates that T.Fe is low, so it is determined that the reformed Al input is insufficient and the Al modifier is charged. Perform operational actions to increase the volume. FIG. 10 is a diagram schematically showing the operation method according to the present invention described above, and the operation in the region where the slag thickness is thin or thick indicated by the elliptical solid line is indicated by an elliptical broken line where T.Fe is appropriate. Shows the operation action to the operation of the area.

  Until now, it has relied on visual measurement of slag thickness by the operator, so it has become possible to properly administer slag-reforming aluminum that has been overdosed because of the need to operate on the safe side.

  In addition, based on the calculated slag thickness according to the present invention, the T.V. When determining Fe, the operating conditions are classified into several groups and their T.I. A correlation between the actual value of Fe and the calculated slag thickness may be obtained in advance, and the calibration curve may be determined in advance by the method of least squares or the like.

It is a figure which shows the slag outflow amount measuring apparatus which concerns on this invention. It is a figure which shows the flow of the measurement process of this invention. It is a figure which shows the process flow of the ratio of slag and molten steel, and slag width calculation. It is the figure which represented typically to slug width calculation. It is the figure which represented the outgoing steel flow cross section typically. It is a figure explaining calculation of the molten steel width and flow velocity in a steel outlet. It is a figure which shows typically the state of the steel output flow at the time of normal steel output, and when using a slag cut ball. It is a figure which shows an example of the slag thickness measurement result in the receiving steel pan using this invention. It is a figure which shows an example which investigated the relationship between slag thickness calculation value and T.Fe in slag. It is the figure which showed the operation method by this invention typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Converter 2 Steel outlet 3 Steel pan 4 Molten steel trolley 5 Molten steel 6 Slag 7 Visible camera 8 Infrared camera 9 Converter control device 10 Slag outflow amount calculation device 11 Furnace iron core 12 Slag cut ball 13 Molten steel (mixed slag) Including the state of

Claims (12)

A method for quantifying the amount of slag flowing out from a converter into a steel pan,
Triggered by the reception of the steel start signal,
The steel flow flowing out from the steel outlet of the converter is imaged with a visible camera and infrared camera,
The flow rate of the steel exit flow is obtained by image processing of an image captured by a visible camera, the width of the steel exit flow is obtained by image processing of an image captured by an infrared camera, and the area ratio occupied by the slag and molten steel is determined. Calculate the slag width based on the area ratio and the width of the steel flow,
A converter slag outflow amount quantification method, wherein a process of calculating a slag outflow amount based on the calculated flow rate and slag width of a steel output flow is performed until reception of a steel output end signal . In the converter slag outflow amount quantification method according to claim 1,
The converter slag outflow amount quantification method characterized in that the area ratio is calculated by ternizing an image captured by an infrared camera with luminance. In the converter slag outflow quantity quantification method in any one of Claim 1 or Claim 2,
Estimating the flow rate and slag width of the steel flow immediately after the steel outlet from the flow rate and slag width of the calculated steel flow, and calculating the slag flow rate based on them, Method. In the converter slag outflow amount quantification method according to any one of claims 1 to 3,
A converter slag outflow amount quantification method characterized in that, when a slag cut ball is used at the end of the steel output, the flow is calculated as a hollow cylindrical steel output from the timing of the start of use of the slag cut ball. A converter slag outflow amount quantification device for quantifying the amount of slag flowing out from a converter into a steel pan,
A converter control device for issuing a steel output start signal and a steel output end signal;
A visible camera and an infrared camera for imaging the steel exit flow flowing out from the steel exit of the converter;
Image processing means for performing image processing of the captured image, slag flow velocity calculating means and slag width calculating means for calculating the flow speed and slag width of the outgoing steel flow based on the data of the image processing means, and starting from the start of steel output based on them A slag outflow amount calculating device for calculating the slag outflow amount until the end of steel ,
The slag width calculating means obtains the width of the outgoing steel flow and the area ratio occupied by the slag and molten steel by image processing of an image captured by an infrared camera, and calculates based on the area ratio and the width of the outgoing steel flow A converter slag outflow amount quantification device characterized in that: In the converter slag outflow quantification device according to claim 5,
The converter slag outflow amount quantification apparatus, wherein the slag width calculation means calculates the area ratio by ternizing an image captured by an infrared camera with luminance. In the converter slag outflow amount quantification device according to claim 5 or 6,
The slag outflow rate calculating device estimates the flow rate and slag width of the outgoing steel flow immediately after the outgoing steel outlet from the calculated flow rate and slag width of the outgoing steel flow, and calculates the slag outflow amount based on them. A converter slag outflow quantification device characterized in that. In the converter slag outflow amount quantification device according to any one of claims 5 to 7,
When the slag outflow amount calculating device uses a slag cut ball at the end of steel output, the slag outflow amount is calculated as a hollow cylindrical steel output from the timing of starting the use of the slag cut ball. Runoff quantification device.   The slag thickness in the steel receiving pan is calculated in real time from the slag outflow amount obtained by the converter slag outflow amount quantifying method according to any one of claims 1 to 4. Slag thickness calculation method.   Based on the slag thickness calculated by the slag thickness calculation method in the steel receiving pan according to claim 9, the T.I. T. in a converter slag characterized by estimating Fe. Fe estimation method.   Based on the slag thickness calculated by the slag thickness calculation method in the steel pan according to claim 9, the input amount of the slag modifier is determined, and the input amount of the slag modifier is controlled. How to operate the converter. A converter control device for issuing a steel output start signal and a steel output end signal;
A visible camera and an infrared camera for imaging the steel exit flow flowing out from the steel exit of the converter;
Image processing means for performing image processing of the captured image, slag flow velocity calculating means and slag width calculating means for calculating the flow speed and slag width of the outgoing steel flow based on the data of the image processing means, and starting from the start of steel output based on them A slag outflow amount calculating device for calculating the slag outflow amount until the end of steel ,
A slag thickness calculation device for calculating the slag thickness in the receiving steel pan from the slag outflow amount calculated by the slag outflow amount calculation device;
A slag modifier calculation / control device that determines the input amount of the slag modifier based on the slag thickness calculated by the slag thickness calculator, and controls the input amount of the slag modifier;
The slag width calculating means obtains the width of the outgoing steel flow and the area ratio occupied by the slag and molten steel by image processing of an image captured by an infrared camera, and calculates based on the area ratio and the width of the outgoing steel flow A converter operating device characterized by that.

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